Here is the full list of all 69 Diehard Dungeon achievements.
Attain Warrior rank.
Attain Valiant rank.
Attain Adept rank.
Attain Slayer rank.
Attain Hero rank.
Attain Champion rank.
Attain Legend rank.
Attain Diehard rank.
Defeat the Dungeon Master.
Win a Trapdoor game.
Use 20 Teleporters.
Obtain Heartbreaker ability.
Obtain Dash ability.
Obtain Scatter ability.
Obtain Iron Grip ability.
Obtain Heavy Duty ability.
Defeat Stumpy.
Defeat Giant Oaf.
Defeat 2000 enemies.
Pickup 100 hearts.
Destroy 300 lights.
Avoid opening 10 chests.
Avoid picking up 20 hearts.
Destroy 20 chests.
Use 50 tokens.
Defeat 200 enemies by setting them on fire.
Destroy 500 containers with fire.
Survive 20 rooms of Survival
Escape the dungeon at Diehard rank, in Champion Mode, and defeat the Dungeon Master.
Obtain Triple Shot ability.
Obtain Lightfoot ability.
Obtain Repel ability.
Obtain Forget-Me-Not ability.
Obtain Voodoo ability.
Destroy 1000 containers.
Obtain Toasty ability.
Obtain Attract ability.
Complete Fading Light in under 3 minutes.
Achieve rank 10 in Mayhem.
Escape the dungeon in Champion Mode.
Obtain Trigger Happy ability.
Obtain Looter ability.
Obtain Kaboom ability.
Obtain Pierce ability.
Obtain Fireproof ability.
Obtain Slash ability.
Obtain Mithridate ability.
Obtain Sense ability.
Defeat Mr Illusion.
Obtain Reflex ability.
Defeat Hive Mind.
Collect 10,000 treasure.
Obtain Knives ability.
Have 20 tokens.
Escape the dungeon.
Open the gold chest.
Defeat Evil Chest.
Obtain Houdini ability.
The Companion Chest upgrades to its maximum level.
Defeat Zombie Chest.
Attain Fighter rank.
Obtain Vision ability.
Obtain Courage ability.